Apparatus for electric resistance heating



. 1, 1931. o. E. ANDRUS APPARATUS FOR ELEC TRI C RES I S TANCE HEATI NG Filed Sept.

FIG.

.5 MM wk Mn A 5 r. r O

A TTORNEY.

Patented Dem-1, 1931 UNITED. STATES ORRIN E. ANDR'U'S, OF WAUWATOSA, WISCONSIN, LSSIGNOR TO 1. 0. SMITH CORPORA- PATENTIVOFFICE 'IION, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW YORK urmrus ron'nmc'rnic mzsrsrmcr: mrme Application filed September 10, 1930. Serial No. 480,871.

. in current is transmltted to the work to be heated-by means of roller electrodes.

Anobject of the invention is to provide an apparatus for moving a roller resistance heating electrode relative to the work to.

be heated which eliminates slippage of said electrode. 1

Various other objects will be apparent from the following description and claims.

The invention will be best understood by referring to the accompanying drawings in which:

Figure 1 is an elevation of the toner elec-.

trode assembly. Fig; 2 is a top view of the assembly; Fig. 3 is a side view of a modified embodiment of the invention."

Fig. 4 is an end view of another modification'. Y

Fig. 5 is a similar view of another modified embodiment of the invention.

In the process of progressively heating metal parts for heat treating or welding. by.

electric resistance, the passage of heavy current into the work. to be heated is preferably accomplished by means of roller electrodes. In progressive resistance heati pg the passage of'current into thework is accom-.

panied by sufficient pressure to secure good electrical contact preferably exerted through the electrodes themselves. The result is that the roller often lacks sufficient traction to overcome the frictionof the bearing in which it rotates, or" in case the roller electrode propels the heating apparatus along the work,

it lacks traction to move the apparatus along said work. Slippage of the'electrode in either event usually results in burning the parts to be heat'treated and injurin the electrode.

The electrode 1 is j ournalle in the bracket '2 ofthe frame 3 of the-welding apparatus.

Suitable bearings 4- and 5 support the axle 6. A sprocketi'i', as shown'in and 2,

is keyed to the axle 6.

A traction wheel.8, adapted to contact with the work 9 to be welded, is'journalled to the frame 3 by means of suitable bearings 10 and 11 adapted to support the axle,

ployed within the wheel and electrode are, of unequal sizen A chain 14 is pla'cedover the sprockets 7 and 13 so that rotation of the traction wheel 8 will effect a coordinated rotation of the roller electrode 1. e The frame 3, bearing the electrode 1 and the traction wheel 8, ma be propelled along the work 9 to be heate by suitable means,

I A or the work maybe propelled beneath the electrode to eflect the relative movement.

The traction wheel 8 may provided with a rubber tire 15 to increase its traction andto insulate it from the work.

As the wheel 8 is rotated its progress relative to the work 9, the roller electrode 1 is rotated at the same peripheral velocity as said wheel and moves relative to the work at the same speed. Thus there is no chance for slippage with its accompanying harmful effects. q

The modification shgwn in Fig. 3 employs a train of gears 16,17, and 18.to effect coordinated movement between the roller 1 and the wheel 8. Y

. In the embodiment shownin Fig. 4 the traction wheel 8 is mounted upon the same shaft as the roller electrode 1 to secure positive coordination of rotation.

"In Fig. 5 the traction wheels 8 .areshown to be in abutting relation to the roller-electrode 1 v i v Various other embodiments may be emthe scope of the appended claims.

'I claim:

'1. In an electric resistance heating ap.-. paratus, a roller electrode, means for advancing said roller relativethe work to be heated and means for coordinating the rotation of the roller with the rate of advance, thereby eliminating slippa September, 1930.

aratus a roller electrode, a frame mountin or sai electrode, means for movin sai frame relative to the work thereb a vaneing said 'roller alon the work to and means for coo inating the rotation of said. electrode with the rate of advance,

thereby eliminating slippage.

3. In an electmc resistance heating aparatns a roller electrode, a frame mounting frame relative to the work to be heated, and means for coordinating the rotation of the roller electrode-with the rate of advance thereof, comprising means for rotating the traction wheel and the roller electrode at the I same peripheral velocit In witness whereof I ave si ed my name at Milwaukee, W lSCOIISlIMUthIS 6th day of ORRIN E. ANDRUS.

heated,

sai electrode, a traction wheel adapte to contact with the work and to advance said 

